How to Replace Double with Single Quotes in JavaScript

Replace Double with Single Quotes in Strings #

Use the String.replaceAll() method to replace double with single quotes, e.g. const replaced = str.replaceAll('"', "'");. The replaceAll method will return a new string where all occurrences of double quotes are replaced with single quotes.

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const str = 'He said: "test 123"';

const replaced = str.replaceAll('"', "'");
console.log(replaced); // 👉️ "He said: 'test 123'"

We passed the following arguments to the String.replaceAll method:

1. a substring to match in the string. (we match all double quotes)
2. a replacement for each match. (we replace each double quote with a single) quote.

Alternatively, you can use backticks, if you find that more readable.

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const str = 'He said: "test 123"';

const replaced = str.replaceAll(`"`, `'`);
console.log(replaced); // 👉️ "He said: 'test 123'"

We used backticks to wrap the parameters we passed to the replaceAll method. This achieves the same result as alternating single and double quotes.

Alternatively, you can use the replace() method.

Use the String.replace() method to replace double with single quotes, e.g. const replaced = str.replace(/"/g, "'");. The replace method will return a new string where all occurrences of double quotes are replaced with single quotes.

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const str = 'He said: "test 123"';

const replaced = str.replace(/"/g, "'");
console.log(replaced); // 👉️ "He said: 'test 123'"

The first parameter we passed to the String.replace method is a regular expression that matches all double quotes.

We used the g (global) flag because we want to match all occurrences of a double quote in the string, and not just the first occurrence.

We provided a single quote as the replacement for each match.

If you ever need help reading a regular expression, check out this regex cheatsheet by MDN.

Further Reading #

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• Check if String ends with Substring in JavaScript
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